TTP# 332724 - Regression: EDITOR: Texture: CRASH: Reimporting a texture that is not a power of two results in a crash
Reimporting a non-power of 2 texture would cause a modal dialog to open, causing the texture editor viewport to be ticked for render while the texture was still being reimported. This lead to a crash due to the texture having no resource allocated.
The rendering in the texture editor is now disabled while a reimport takes place.
I also moved the Pre/PostReimport delegates from FAssetEditorToolkit to FReimportManager to ensure that all reimport cases are caught (eg, reimporting from the Content Browser while an asset editor is open).
ReviewedBy Thomas.Sarkanen, Max.Preussner
[CL 2056305 by Jamie Dale in Main branch]
